@ICV Welcome. I don't know what the vanilla values of the different armor types are. What I know is that there are 5 types of armor in GTA5:
Super Light Armor: (20% armor)
Light Armor: (40%)
Standard Armor: (60%)
Heavy Armor: (80%)
Super Heavy Armor: (100%)
So it would be awesome if you can make a mod in which you can change the armor strength of all types for example 2x stronger, 4x stronger, 6x stronger and 8x stronger.